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Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., and the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions with 6.245 million residents in 2020. The city's population at the 2020 census was 1,603,797, and over 56 million people live within 250 mi (400 km) of Philadelphia.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's independence. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history". Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits. The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C., was under construction.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research. As of 2021[update], the Philadelphia metropolitan area was the state's largest and nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion. The city is home to five Fortune 500 corporate headquarters as of 2022. The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums. Philadelphia and the Delaware Valley are a biotechnology and venture capital hub; and the Philadelphia Stock Exchange, owned by NASDAQ, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station, the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transport and logistics infrastructure, including Philadelphia International Airport, the PhilaPort seaport, freight rail infrastructure, roadway traffic capacity, and warehouse storage space, are all expanding.

Tongjiang City belongs to Jiamusi City, Heilongjiang Province. Tongjiang City is located on the south bank of the confluence of Songhua River and Heilongjiang River in the northeast of Heilongjiang Province, between 132 °18 °32 "- 134 °7" 15 "east longitude and 47 °25 °47"-48 °17 °20 "north latitude. Fuyuan City is bordered by Fuyuan City in the east, Fujin City and Raohe County in the south, Songhua River and Suibin County in the west, and the Russian Jewish Autonomous Prefecture in the north. The border is 170 kilometers long. With a total area of 6300 square kilometers, it has jurisdiction over 6 towns, 2 townships and 2 nationality townships, with 6 state-owned farms and a total population of 211609 (2015). Tongjiang City is the main settlement of Hezhe nationality, one of the "six small" ethnic groups in China, and it is the starting point at the northern end of the "Tongsan" highway, which runs through the main artery of China's north-south highway. Within the territory
Airport In Tongjiang - Jiamusi Dongjiao Airport
Jiamusi Dongjiao International Airport (Jiamusi Dongjiao International Airport, IATA: JMU, ICAO: ZYJM), located on Chang'an East Road, Dongfeng District, Jiamusi City, Heilongjiang Province, China, 10 kilometers away from Jiamusi City, is a 4C-level military-civilian joint international feeder airport   .
Jiamusi Dongjiao International Airport was founded in 1932. Its predecessor was Jiamusi Station of Civil Aviation of China established in 1958. On December 10, 2009, Jiamusi Dongjiao Airport's first-class air port was officially opened to the public, and the airport became an international airport.   .
According to the official website of the airport in February 2021, Jiamusi Dongjiao International Airport has a terminal area of ​​5,728 square meters, a runway 2,500 meters long, and a width of 45 meters; the civil aviation station has 6 seats, which can park 5 C-class aircraft, B 1 class aircraft; it can meet the needs of annual passenger throughput of 300,000 passengers     .
In 2021, Jiamusi Dongjiao International Airport will handle a total of 805,700 passengers, a year-on-year increase of 21.7%; cargo and mail throughput will be 1,294.4 tons, a year-on-year increase of 0.4%; aircraft movements will be 6,968, a year-on-year increase of 20.6%.  
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